November 19, 2014 Homework : Quiz on Tues. 11/25 Organize notes on Physical and Chemical Change...
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Transcript of November 19, 2014 Homework : Quiz on Tues. 11/25 Organize notes on Physical and Chemical Change...
November 19, 2014 Homework: Quiz on Tues. 11/25 Organize notes on
Physical and Chemical Change into a T- Chart --- may draw pictures as well. Complete on copy paper-Use a ruler
Do Now:Agenda- HomeworkUpdate T.O.C- pg. 37-Observing Chemical reactionsOpen textbooks to pg. 18- Add Precipitate to Log of Sci.
terms (pg. 30).Open binders to pg. 36-Evidence of Chemical Change
Contrast Physical and Chemical Change
Make a T- Chart similar to the one started below:
Physical Change Chemical Change
Liquid Water –Freezing into snow/Ice (solid)
Cooking an Egg
The parts of water do notChange , just its form, itIs still H2O
Evidence of a Chemical Reaction
There is a formation of gas which can be seen by a fizzing or bubbling
The reaction will cause heat (temperature Change), light or odor to be emitted- Changes in chemical properties
A color change is producedA solid (precipitate) is formed during the
change
On the back of pg. 36
The key characteristic of a chemical reaction is the production of new materials that are chemically different from the starting materials.
Let’s see…http://www.youtube.com/watch?v=DOb_BRydnCs
What happens to the mass of the matter during chemical reactions?
A Chemical change, or Chemical Reaction, is like scrambling the letters of a word to make new words. Ex: Elements Steel + Men
Were any of the letters removed?Law of Conservation of Mass- Matter can not be
created or destroyed in any physical/ chemical change or reaction only (made) into something else.Atoms are rearranged
Which of these pictures is an example of a physical change? Which is a chemical change?-Write a C for Chemical and P for the Physical. Post it1 2 3-
popcornChopping Wood
Burning Logs
November 20, 2014
Homework: Complete Section 1 Review Sheet- Quiz on Tuesday- “Section Notes/Study Guide,” online.
Do Now: Agenda- Write Homework-Take out (P & C Change T-Chart) Get Your and two partners lab journals Update Lab Journal T.O.C pg. 5 -Alka Seltzer to the rescue! Begin writing materials list and procedure on pg. 5
Alka Seltzer to the Rescue Lab
Questions to consider for observations:
Look for Evidence of a Chemical ReactionDid any of these things happen?
There is a formation of gas which can be seen by a fizzing or bubbling
The reaction will cause heat, light or odor to be emittedA color change is producedA solid is formed during the change
Conclusion Questions- Record in Journal
1)Using your observations- What evidence do you have that a chemical reaction took place when you added the alka-seltzer to the water?
2) Describe how you think this experiment relates to the Law of Conservation of Mass? (What were your results?)
3)Write your own definition of the law of conservation of mass.
4)What is another experiment you could think of doing that could produce similar observations?
November 21, 2014
Homework: Study for quiz Tuesday- Use online notes/ study guide, T- Chart, Review sheet etc… Make Flash Cards
Do Now: (6 Minutes)Agenda- Write Homework- Take out Section 1 Review
Sheet.Get your and a Lab partners Lab JournalReview Homework Answers with a partner
Section 1 Review….1.Atom2.Compound3. Solution4.Chemical Reaction5.Precipitate6.Mixture7.Chemical Bond8.Molecule9.Element10.Chemistry
Event Observable Changes
Type of Change
Baking a Cake Color becomes golden brown- gooey liquid to crumbly solid
Chemical
Burning a log Color turns black, changes from wood to dusty ashes
Chemical
Freezing water Color becomes cloudy white, changes from liquid to solid
Physical
Conclusion Questions- Record in Journal
1)Using your observations- What evidence do you have that a chemical reaction took place when you added the alka-seltzer to the water?
2) Describe how you think this experiment relates to the Law of Conservation of Mass? (What were your results?)
3)Write your own definition of the law of conservation of mass.
4)What is another experiment you could think of doing that could produce similar observations?